Systems and methods for generating key press status messages within telecommunications systems or other networks
First Claim
1. A method for detecting key press status within a telecommunications system, said method comprising the steps of:
- generating distinct DC analog voltage signals in response to a plurality of key presses;
generating an analog voice signal;
temporally combining said generated DC analog signals with said generated analog voice signal to form an analog composite signal;
converting said analog composite signal to a digital composite signal; and
filtering said digital composite signal with a subtractive sample-delta filtering algorithm to detect key press status data within said digital composite signal.
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Accused Products
Abstract
Systems and method for monitoring and generating key pad status messages in a telecommunications network. A resistor ladder network is provided to generate distinct DC-level analog voltage signals in response to the pressing of any one of a plurality to keys of a key pad. A combiner circuit is employed to combine the DC-level analog voltage signals with an analog voice signal received from an audio transducer to form a composite analog signal, and a coder/decoder circuit is provided to convert the composite analog signal into a composite digital signal. A digital signal processing circuit executes a subtractive sample delta filtering algorithm to determine whether data indicative of a key press is included within the composite digital signal, and generates status messages indicative of a key press upon determining that a key has been pressed.
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Citations
20 Claims
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1. A method for detecting key press status within a telecommunications system, said method comprising the steps of:
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generating distinct DC analog voltage signals in response to a plurality of key presses; generating an analog voice signal; temporally combining said generated DC analog signals with said generated analog voice signal to form an analog composite signal; converting said analog composite signal to a digital composite signal; and filtering said digital composite signal with a subtractive sample-delta filtering algorithm to detect key press status data within said digital composite signal. - View Dependent Claims (2, 3, 4, 5)
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6. A signal processor for detecting key press status within a telecommunications network, said signal processor comprising:
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a processing circuit and an associated memory; said memory storing a program that, when accessed and executed by said processing circuit, enables said processing circuit to implement a subtractive sample-delta filtering function for detecting key press status data within an acquired frame of digital data. - View Dependent Claims (7)
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8. A system for managing key press status data within a telecommunications network, said system comprising:
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a circuit network associated with a plurality of key pad keys for generating a plurality of distinct analog DC signals in response to a depression of said plurality of key pad keys; an audio transducer for generating an analog voice signal; a multiplexor circuit coupled to said circuit network and said audio transducer for temporally combining said generated analog DC signals with said analog voice signal to produce a composite analog signal; an analog-to-digital converter circuit for converting said composite analog signal to a composite digital data signal; and a digital signal processing circuit for filtering said composite digital signal with a subtractive sample-delta filtering algorithm to detect key press status data within said composite digital signal. - View Dependent Claims (9, 10, 11)
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12. A system for managing key press status data within a telecommunications network, said system comprising:
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a circuit network associated with a plurality of key pad keys for generating a plurality of distinct analog DC signals in response to a depression of the plurality of key pad keys; an audio transducer for generating an analog voice signal; a multiplexor circuit coupled to said circuit network and said audio transducer for temporally combining said generated analog DC signals with said analog voice signal to produce a composite analog signal; an analog-to-digital converter circuit for converting said composite analog signal to a composite digital signal; and a digital signal processing circuit for filtering said composite digital signal to detect key press status data within said composite digital signal. - View Dependent Claims (13, 14, 15, 16)
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17. A method for detecting key press status within a telecommunications system, said method comprising the steps of:
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generating distinct DC analog voltage signals in response to a plurality of key presses; generating an analog voice signal; temporally combining said generated DC analog signals with said generated analog voice signal to form an analog composite signal; converting said analog composite signal to a digital composite signal; and filtering said digital composite signal to detect key press status data within said digital composite signal. - View Dependent Claims (18, 19, 20)
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Specification